******************************************************************* *** Atmospheric CO2 concentrations (ppmv) derived from flask *** *** and in situ air samples collected at Baring Head, *** *** New Zealand (flask data) *** *** Source: C.D. Keeling *** *** T.P. Whorf, and the Carbon Dioxide Research Group *** *** Scripps Institution of Oceanography (SIO) *** *** University of California *** *** La Jolla, California USA 92093-0444 *** *** *** *** May 2005 *** *** *** ******************************************************************* Year Jan. Feb. Mar. Apr. May Jun. July Aug. Sept. Oct. Nov. Dec. Annual Annual-Fitted 1977 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 332.74 -99.99 332.52 332.34 -99.99 332.77 -99.99 -99.99 1978 333.39 333.26 332.84 -99.99 333.26 333.77 334.90 334.11 -99.99 -99.99 334.39 -99.99 -99.99 333.79 1979 333.60 -99.99 -99.99 -99.99 334.61 -99.99 335.68 336.34 336.28 -99.99 334.88 335.47 -99.99 335.16 1980 -99.99 335.78 336.29 336.35 337.05 336.99 -99.99 337.40 -99.99 337.40 337.78 337.55 -99.99 336.85 1981 -99.99 337.20 337.30 337.65 338.85 338.69 -99.99 -99.99 -99.99 337.89 -99.99 -99.99 -99.99 338.26 1982 -99.99 -99.99 338.61 339.08 -99.99 339.73 339.49 340.42 339.81 -99.99 340.02 -99.99 -99.99 339.39 1983 -99.99 -99.99 340.31 -99.99 -99.99 341.11 341.27 342.05 -99.99 -99.99 341.48 -99.99 -99.99 340.95 1984 341.42 341.50 341.44 341.00 341.90 -99.99 342.96 -99.99 342.75 -99.99 342.90 -99.99 -99.99 342.19 1985 -99.99 342.59 342.54 342.94 343.20 -99.99 344.10 -99.99 -99.99 343.76 -99.99 343.99 -99.99 343.48 1986 343.23 -99.99 344.86 -99.99 345.02 -99.99 345.40 345.47 345.97 -99.99 -99.99 -99.99 -99.99 345.10 1987 -99.99 346.38 345.61 -99.99 346.83 346.70 347.19 347.32 348.21 347.36 347.19 -99.99 -99.99 346.82 1988 347.92 347.82 347.96 348.11 348.94 348.47 348.89 -99.99 -99.99 349.56 349.01 -99.99 -99.99 348.72 1989 349.56 348.83 350.13 350.58 350.34 350.03 -99.99 -99.99 350.83 -99.99 351.43 350.46 -99.99 350.37 1990 350.59 -99.99 350.93 349.76 -99.99 351.49 352.27 351.97 352.93 351.35 352.34 352.10 (351.48) 351.58 1991 351.99 351.76 352.15 -99.99 352.64 354.18 353.59 -99.99 352.99 352.90 352.94 -99.99 -99.99 352.84 1992 352.21 -99.99 -99.99 353.40 353.53 354.90 354.74 355.25 354.82 354.76 354.22 -99.99 -99.99 354.04 1993 353.84 353.62 355.35 354.41 355.05 354.57 355.84 355.49 356.04 355.13 355.63 355.14 355.01 354.97 1994 354.76 355.14 356.11 355.96 355.88 356.13 357.06 357.40 357.61 357.73 -99.99 -99.99 (356.46) 356.44 1995 356.50 356.19 -99.99 357.09 357.07 -99.99 358.66 358.97 358.86 358.17 358.88 358.46 (357.83) 357.95 1996 -99.99 358.98 -99.99 358.68 359.78 -99.99 359.98 360.45 -99.99 359.26 359.85 360.67 -99.99 359.63 1997 -99.99 -99.99 360.18 360.00 360.33 -99.99 -99.99 361.76 -99.99 -99.99 -99.99 -99.99 -99.99 361.13 1998 362.32 362.51 362.77 363.00 363.00 -99.99 364.09 364.55 364.86 -99.99 -99.99 364.32 -99.99 363.61 1999 364.96 365.43 -99.99 363.89 365.10 365.34 366.19 -99.99 -99.99 366.54 366.07 365.82 -99.99 365.40 2000 365.66 -99.99 366.18 -99.99 366.13 -99.99 367.59 366.24 -99.99 366.98 367.34 -99.99 -99.99 366.61 2001 -99.99 -99.99 367.04 367.20 368.15 -99.99 -99.99 -99.99 368.57 368.99 -99.99 -99.99 -99.99 368.17 2002 -99.99 -99.99 -99.99 -99.99 369.91 373.28 371.14 -99.99 -99.99 371.60 371.68 -99.99 -99.99 370.56 2003 371.55 -99.99 -99.99 372.26 372.71 373.28 -99.99 373.41 -99.99 373.41 -99.99 -99.99 -99.99 -99.99 2004 -99.99 -99.99 374.42 374.37 -99.99 375.04 -99.99 374.94 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 Monthly values are expressed in parts per million (ppm) and reported in the 2003A SIO manometric mole fraction scale. The monthly values have been adjusted to the 15th of each month. Missing values are denoted by -99.99. The "annual" average is the arithmetic mean of the twelve monthly values. In years with one or two missing monthly values, annual values were calculated by substituting a fit value (4-harmonics with gain factor and spline) for that month and then averaging the twelve monthly values.